Fans watch a performance during Lollapalooza on Friday, Aug. 1, 2014, in Chicago. Once the vagabond of the music festival and touring circuit, Lollapalooza marks its 10th anniversary in Chicago. (AP Photo/Stacy Thacker) Stacy Thacker AP

Fans dance during the second day of Lollapalooza on Saturday, Aug. 2, 2014, in Chicago. Once the vagabond of the music festival and touring circuit, Lollapalooza marks its 10th anniversary in Chicago. (AP Photo/Stacy Thacker) Stacy Thacker AP